CARDANUS COSTATUS. 229 



NOTE XXXII. 



A NEW SPECIES OF THE LUCANOID GENUS 

 CARDANUS 



DESCRIHED BY 



C. RITSEMA Cz. 



Cardanus costatus, nov. spec. 



Length (with mandibles) 9 ram., breadth at the shoulders 

 not quite 3 mm. — Resembling C. sulcatus Westw. but 

 considerably smaller and easily recognizable by the distinctly 

 costate and very regularly punctate elytra and by the 

 rounded ocular canthus. 



The front margin of the head is faintly concave, laterally 

 diverging towards the ocular canthus, the latter with 

 broadly rounded anterior angles, impunctate and with raised 

 margins; the clypeus small, rounded anteriorly and punctate. 

 The mandibles smooth and shining, slightly curved, with 

 a small toothlike knob at the inner margin near the base; 

 the basal two-thirds of the outer margin finely raised. 

 The upper surface of the head shows a large triangular 

 impression the top of which is directed towards the occiput; 

 it is covered with punctures which along the front margin 

 (base of the triangle) are smaller and more densely set 

 than in the middle; a smooth, shining spot is present 

 at the anterior portion of the inner orbits. 



The thorax is distinctly longer than broad; the front 

 angles are protruding and narrowly rounded ; the sides are 

 parallel, their margins finely crenulate; the basal margin 

 is depressed and faintly bisinuate ; just behind the middle 



Notes from the Leyden Museum, Vol. XXIII. 



